ALCo's PA-1 and PA-2 were diesel locomotives built by the American Locomotive Company in a partnership with General Electric in Schenectady, New York during the years 1947 to 1953. These A1A-A1A locomotives were powered by ALCo's model 244 16-cylinder engine. The earlier PA-1 had a 2,000 hp (1,500 kW) engine and the PA-2 was slightly more powerful at 2,250 hp (1680 kW). The PA series was designed to be used in passenger service, whereas the companion FA model was a freight hauler.

ATSF purchased 14 PA-1s during the years 1946 to 1948, along with a like number of PB-1 booster units. The equipment was furnished in Santa Fe's iconic Warbonnet livery.

Requires the Boston & Albany DLC package for Train Simulator Classic, available from Steam at:
https://store.steampowered.com/app/2202028/Train_Simulator_Boston__Albany_Boston__Springfield_Route_AddOn/

To install, first unzip the download, which contains a single RWP file. Install the RWP using the Package Manager feature of the program Utilites.exe which resides in you RailWorks folder. Done! There is no need to copy any other files from your B&A folders and none of your existing B&A files will be overwritten.

One PreLoad consisting of an A-B-A light locomotive arrangement is provided for Quick Drive service. Or you can always make your own scenarios; in fact you are encouraged to do so! The A and B units appear in the scenario editor as "G-TraX ALCo PA ATSF" and "G-TraX ALCo PB ATSF."

Note from ricksan to librarian: the download archive contains two geo files, both of which I own and which I authorize to be included in the package. This is necessary because in addition to this being a repaint package, certain physical details of the locomotive have been added or reworked.